Hello, welcome to the DB! Here we try to keep the content as close to the official Pokémon games as possible, so questions about ROMs (like Pokémon Adventure Red) aren't allowed. The chat room is the best place to ask questions about unofficial games :)
But, according to the video below, it should evolve at level 16. I hope this helps :D
https://www.youtube.com/watch?v=2O55htfSqKI#t=1m50s
